How To: Retrograde Urethrogram

One of the hallmarks of urethral injury is blood and the meatus in males. The standard answer to the question “how do you evaluate for it?” is “retrograde urethrogram.” Unfortunately, too few people know how to perform this test, and not all radiologists are familiar. Many times it falls to the urologist, who may not be immediately available.

The technique is simple. The following items are needed:

  • A urine specimen cup
  • A tube of KY jelly (not the little unit dose packs)
  • A bottle of renografin or ultravist contrast
  • A 50-60 cc Toomey syringe (slip-tip)
  • A fluoroscopy suite

Pour 25cc of contrast and 25cc of KY jelly in the specimen cup, cap it and shake well. Draw the contrast jelly up into the syringe. Under fluoro, insert the tip of the syringe into the penis and pull the penis toward yourself, pinching the meatus around the tip of the syringe. Slowly inject all the contrast, watching the contrast column on the fluoro screen. Once there is easy flow into the bladder, you can stop the study. If you see extravasation into the soft tissues, stop the study and call Urology.

The advantages to using this technique are:

  • The contrast/jelly mix creates a contrast gel that is less likely to leak from the meatus when injected
  • The jelly makes it easy to insert the catheter if no urethral injury is detected

Normal urethrogram:

Normal urethrogram

Abnormal urethrogram:

Abnormal urethrogram

CIWA Demystified

What exactly is the CIWA protocol?

It is a tool used commonly in the US that helps clinicians assess and treat potential alcohol withdrawal. A significant amount of injury in this country is due to the overuse of alcohol. A subset of these patients are admitted and do not have access to alcohol. They may begin to withdraw within a few days, and this condition can lead to dangerous complications.

The Clinical Institute Withdrawal Assessment measures 10 items that are associated with withdrawal:

  • Nausea / vomiting
  • Anxiety
  • Paroxysmal sweats
  • Tactile disturbances (itching, bugs crawling on skin, etc)
  • Visual disturbances
  • Tremors
  • Agitation
  • Orientation
  • Auditory disturbances
  • Headache

All items are measured on a scale of 0-7 with the exception of orientation, which uses a scale of 0-4. All subscores are tallied to arrive at the final score.

The total score is used to determine whether benzodiazepines should be given to ameliorate symptoms or avoid seizures. Typically, a threshold is selected (8 or 10) and no medications are needed as long as the patient is under it. Once it is exceeded, graduated doses of lorazepam or diazepam are given and vital signs and CIWA scores are repeated regularly. The protocol is discontinued once the patient has three determinations that are under the threshold.

The individual dosing scale and monitoring routine varies by hospital. Look at your hospital policy manual to get specifics for your institution.

For a copy of the CIWA scoring criteria, click here.

Trauma 20 Years Ago: Intraosseous Access

The pre-hospital concept of “scoop and run” was first popularized in the mid-1980’s. It came about because there was recognition that significant delays were occurring on scene. A big time sink was obtaining IV access. The failure rate for IV starts in the field was 10-40% and typical start times were in excess of 10 minutes!

As a result of “scoop and run”, the emphasis shifted to airway protection, c-spine stabilization and control of external hemorrhage. A quicker alternative to IV access was sought, and the idea of intraosseous access was revived.

IO access was first described in 1941, and was used in children due to the higher degree of difficulty in obtaining IV access in kids. It did not require visualization of the site and could be inserted in moving ambulances, including helicopters.

The authors of this paper looked at IO infusion using a sternal insertion site. This site was chosen due to the belief that only areas with red marrow were suitable. They found that delivery of fluids and drugs was virtually identical to IV. The authors did cite contraindications to using this device, including previous sternotomy, sternal fracture, osteoporosis, and congenital anomalies like pectus.

Ultimately, this paper revived interest in IO access for adults, which has now evolved to easy-to-insert tibial devices that are inserted with a power drill.

Reference: Evaluation of an Intraosseous Infusion Device for the Resuscitation of Hypovolemic Shock. Holcroft, Blaisdell et al. J Trauma 30(6): 652. 1990.

EZ IO device

How To Predict the Need for Chest Tube in Occult Pneumothorax

Occult pneumothorax occurs somewhere between 2% and 12% in all blunt trauma patients. Many of these pneumothoraces never progress and thus never need treatment. Is there a way that we can identify ones that are likely to get worse?

A retrospective study of 283 blunt trauma patients with occult pneumothorax was presented at the EAST Annual Scientific Assembly last January. A total of 98 of these patients underwent chest tube insertion within 7 days, and 185 patients were successfully observed.

The authors noted an inverse relationship between age and successful conservative management. Patients with more serious injuries failed expectant management more frequently. Finally, patients with more rib fractures also tended to fail.

The authors estimated the risk of failure of expectant management based on these critieria and found:

  • Age > 35 – 36%
  • ISS > 24 – 20%
  • Rib fractures >= 4 – 53%

The risk with having none of these was 10%, and the risk with all was 75%! 

The time interval for placement was also interesting. 80% of the failures requiring a chest tube occurred within 24 hours, with most occurring in the first 2 hours. The authors also found that 40% of patients who were placed on a ventilator failed.

Obviously, this is a small retrospective study and the exact criteria for placing a chest tube were not specified. Nevertheless, it provides a simple tool that allows us to keep an eye on a subset of patients who are likely to fail observation of occult pneumothorax.

Reference: Factors Predicting Failed Observation of Occult Pneumothoraces in Blunt Trauma. Selander, Med Univ of South Carolina. EAST 2010 Annual Scientific Assembly.

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